About SPF and SenderID (wildcard an entire IPrange)

About SPF and SenderID (wildcard an entire IPrange)

Now I'm not sure if SPF is working on this way:
1. It will lookup the SPF record of the from domain-name.
2. It will check if the Sender IP is allowed to use this domain-name as an e-mailadress.

Is this right?
But what if I wanna use my own domain-name but I'm sending my e-mail with outlook through the SMTP server of my access ISP? My domain-name doesn't belong to my access ISP.

Now my question is: is it possible to wildcard an entire IPrange or any IP in my SPF records of my domain-names?

 

 

 

 

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